EP0128671A3 - Improvements in or relating to electric motors - Google Patents
Improvements in or relating to electric motors Download PDFInfo
- Publication number
- EP0128671A3 EP0128671A3 EP84303248A EP84303248A EP0128671A3 EP 0128671 A3 EP0128671 A3 EP 0128671A3 EP 84303248 A EP84303248 A EP 84303248A EP 84303248 A EP84303248 A EP 84303248A EP 0128671 A3 EP0128671 A3 EP 0128671A3
- Authority
- EP
- European Patent Office
- Prior art keywords
- winding
- group
- switch means
- series
- coils
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
Links
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P25/00—Arrangements or methods for the control of AC motors characterised by the kind of AC motor or by structural details
- H02P25/16—Arrangements or methods for the control of AC motors characterised by the kind of AC motor or by structural details characterised by the circuit arrangement or by the kind of wiring
- H02P25/18—Arrangements or methods for the control of AC motors characterised by the kind of AC motor or by structural details characterised by the circuit arrangement or by the kind of wiring with arrangements for switching the windings, e.g. with mechanical switches or relays
- H02P25/20—Arrangements or methods for the control of AC motors characterised by the kind of AC motor or by structural details characterised by the circuit arrangement or by the kind of wiring with arrangements for switching the windings, e.g. with mechanical switches or relays for pole-changing
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Control Of Ac Motors In General (AREA)
Abstract
In an A.C. electric motor such as a three-phase two pole
stator motor there are three stator windings, one winding for each
phase. Each winding consists of a plurality of coils of which
plurality half the coils forming a first group (A1 ,A1 , A2, A2 , A3, A3 )
are associated with one pole and the other half forming a second
group (A10, A10 , A11, A11 , A12, A12 ) are associated with the
other pole. In relation to a pole pitch each coil in one group has a
positional counterpart in the other group. First, second and third
semiconductor switch means (S1, S2, S3) are arranged so that
when the third switch means (S3) closed and the first and second
switch means (S1, S2) are open all the coils of the winding are in
series but when only the first and second switch means (S1, S2)
are closed one (A10. A10 ) or more of the coils (A10, A10 , A11,
A11 , A12, A12 ) in series in the second group is/are connected in
parallel with its or their series connected positional counterpart
coil(s) in the first group. Thus in parallel mode connection of the
winding the number of effective turns of the winding is reduced
and the magnetic flux is increased whereas in the series mode
connection by the closed third switch means the effective winding
turns is the sum of the turns of all the coils in both groups, and the
magnetic flux is decreased. The magnitude of the supply current
of one of the phases is measured and if it exceeds a pre
determined value control means operate the switch means to
establish the series mode connection in each of the three
windings otherwise the parallel mode connection exists in all
three. Thus the switching from series to parallel mode and vice-
versa in each winding renders the motor capable of delivering the
power and torque required by the load on the motor whilst
sustaining low energy losses over a typical duty cycle.
Applications Claiming Priority (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB8313503 | 1983-05-17 | ||
| GB838313503A GB8313503D0 (en) | 1983-05-17 | 1983-05-17 | Electric motors and controllers |
| GB8401199 | 1984-01-17 | ||
| GB848401199A GB8401199D0 (en) | 1983-05-17 | 1984-01-17 | Electric motors |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP0128671A2 EP0128671A2 (en) | 1984-12-19 |
| EP0128671A3 true EP0128671A3 (en) | 1986-02-12 |
Family
ID=26286136
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP84303248A Withdrawn EP0128671A3 (en) | 1983-05-17 | 1984-05-14 | Improvements in or relating to electric motors |
Country Status (1)
| Country | Link |
|---|---|
| EP (1) | EP0128671A3 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| AU8722091A (en) * | 1990-10-09 | 1992-04-28 | Stridsberg Innovation Ab | An electric power train for vehicles |
| KR102192346B1 (en) * | 2017-11-22 | 2020-12-17 | 서울과학기술대학교 산학협력단 | Series-Parallel Winding Changeover System and Method thereof |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB912874A (en) * | 1961-05-08 | 1962-12-12 | Hans Still Ag | Improvements in or relating to apparatus including polechanging asynchronous electric motors |
| US3153184A (en) * | 1962-09-28 | 1964-10-13 | Gen Electric | Multi-speed induction type motor |
| GB1199469A (en) * | 1966-11-24 | 1970-07-22 | English Electric Co Ltd | Speed Control of Multi-Speed Induction Motors. |
| DE2046779A1 (en) * | 1969-09-24 | 1971-04-01 | Horwath A | Motor stator winding |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS56117595A (en) * | 1980-02-22 | 1981-09-16 | Mitsubishi Heavy Ind Ltd | Motor for pole change |
-
1984
- 1984-05-14 EP EP84303248A patent/EP0128671A3/en not_active Withdrawn
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB912874A (en) * | 1961-05-08 | 1962-12-12 | Hans Still Ag | Improvements in or relating to apparatus including polechanging asynchronous electric motors |
| US3153184A (en) * | 1962-09-28 | 1964-10-13 | Gen Electric | Multi-speed induction type motor |
| GB1199469A (en) * | 1966-11-24 | 1970-07-22 | English Electric Co Ltd | Speed Control of Multi-Speed Induction Motors. |
| DE2046779A1 (en) * | 1969-09-24 | 1971-04-01 | Horwath A | Motor stator winding |
Non-Patent Citations (1)
| Title |
|---|
| PATENT ABSTRACTS OF JAPAN, vol. 5, no. 197 (E-86)[869], 15th December 1981; & JP - A - 56 117 595 (MITSUBISHI JUKOGYO K.K.) 16-09-1981 * |
Also Published As
| Publication number | Publication date |
|---|---|
| EP0128671A2 (en) | 1984-12-19 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
Free format text: ORIGINAL CODE: 0009012 |
|
| AK | Designated contracting states |
Designated state(s): DE FR GB IT SE |
|
| PUAL | Search report despatched |
Free format text: ORIGINAL CODE: 0009013 |
|
| AK | Designated contracting states |
Designated state(s): DE FR GB IT SE |
|
| 17P | Request for examination filed |
Effective date: 19860812 |
|
| 17Q | First examination report despatched |
Effective date: 19871120 |
|
| STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN |
|
| 18D | Application deemed to be withdrawn |
Effective date: 19890418 |